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Finite Element Analysis On The Performance Simulation Of High Temperature Piezoelectric Sensor

Posted on:2017-08-16Degree:MasterType:Thesis
Country:ChinaCandidate:J LiFull Text:PDF
GTID:2348330512959616Subject:Mechanical engineering
Abstract/Summary:PDF Full Text Request
With the complex structure and multiple factors affecting the performance, high temperature piezoelectric sensors are facing the difficulties in experiment, verification and high cost under the high temperature conditions. Therefore, the finite element analysis method is used to simulate the performance of the sensor, which has a very realistic significance and economic benefits.Based on the working principle of the piezoelectric sensor and the simulation analysis of the target, the finite element analysis program and the finite element model of the high temperature piezoelectric sensor are designed in this thesis, and the contents, methods, models and key points of the static and dynamic analysis are defined also. According to the needs of piezoelectric sensor coupling analysis, the thesis proposed the "three dimensional minimum intersection" CAD modeling processing, which is realizable for standard hexahedral meshes for the whole model, and ensures that the static and dynamic coupling analysis is available.Through the analysis of the mechanical principle of bolt preload, combined with the typical methods of pre-tightening force loading and coupling analysis, the thesis proposed the "interference and contact preload model", which is suitable for coupling analysis of high temperature piezoelectric sensors. The magnitude of interference is roughly confirmed by calculating the bolt pre-tightening force and extension. Basing on the finite element analysis results of "interference and contact preload model", it provides basis and conditions for the temperature preload model and full bonding preload model in other kinds of analysis.On the basis of the bolt preload model, the key components' static characteristics of structure and thermal adaptation are analyzed under all kinds of temperature conditions. It compared with the structural characteristics caused by temperature under the conditions of low temperature, room temperature and high temperature, and analyzed the influence of initial preload caused by temperature change, and evaluated the high temperature working ability of the sensor.Combined bolt preload with temperature and impact to conduct the piezoelectric sensor coupling analysis, which simulated the sensor impact test conditions, dynamic response to the impact of the work process, and achieved the main targets of performance simulation. Through a series of dynamic simulation analysis with high/low temperature, the working principle of sensor in a wide-temperature work status is disclosed, and the high/low temperature performance of the sensor is evaluated and predicted.Based on the results of static and dynamic analysis, the key factors affecting the wide-temperature working performance was carried out and preliminarily verified. The key factors influencing the wide-temperature working performance are the material and structure matching between the bolt and the mass block. The high temperature performance of the sensor is realized by adjusting the selection of the mass block material, which provides the direction and basis for the optimal design of the high temperature piezoelectric sensor.Finally, the full text is summarized, and the research value and significance of this paper are expounded. Further studies on dynamic preload analysis, comparative analysis of impact experiment, parameter optimization, structural design optimization are explicit in the next step research arrangement.
Keywords/Search Tags:Piezoelectric Sensor, Finite Element Analysis, Bolt Preload, Three Dimensional Minimum Intersection, Interference and Contact Preload Model, Wide-temperature, Impact, Dynamic Coupling Analysis
PDF Full Text Request
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